Rotary motor.



P. J. DARLINGTON.

' ROTARY MOTOR.

APPLICATION FILED NOV. 24, I914.

Patented Jan. 4, I916.

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ROTARY MOTOR.

Specification of Letters Patent.

Application filed hTovernber 24, 1914. Serial No. 873,737.

To all whom it may concern:

Be it known that I, PHILIP J. DARLINGTON, a citizen of the UnitedStates, residing at Hartford, in the county of Hartford and State ofConnecticut, have invented new and useful Improvements in Rotary Motors,of which the following is a specification.

This invention relatesto rotary machines such as motors, pumps andblowers, either driving or driven across a pressure difierence or headof water, air, steam or other fluid, although it is illustrated anddescribed asembodied in an air driven motor of a type used for boilertube cleaning.

The object of my invention is to simplify and cheapen the constructionof machines of this class and at'the same time increase their efliciencyand render them longer lived and more cheaply and quickly repaired.

In the accompanying drawings Figure 1 shows a central longitudinalsection, through the admission port, of a motor constructed according tothis invention. Fig. 2 is a transverse section on line 2-2. Fig. 3 1s atransverse section on line 33 with outer shell removed.

lhe motor shown has a cylinder 4 and a rear cylinder cover 5 mountedconcentrically in an outer shell 6. A concentrlc rotary shaft 7,supported in the cylinder 4 and the cover 5, carries a sliding piston orblade 8 in a slot 9 and contacts with the cylindrical Wall of ,aneccentric piston chamber 10 across which piston 8 fits loosely. Thechamber 10 is not of circular form of cross section but may be of anyform such that the piston 8 will fit loosely across it 1n all pos tionsduringrevolution ofshaft 7 An adm ssion port 11 and an exhaust port 12,on opposite sides of the contact line or abutment between shaft 7 andchamber 10, admit and exhaust,

respectively, the motive fluid to and from the chamber to cause rotationof the shaft in a well known manner.

The front end of the cylinder 4 has an externally screw threaded portion13 screw ng into an internally screw threaded portion 14 in the frontend of the shell 6, forcing the cylinder cover 5 against an internalshoulder 15 in. shell 6 and clamping cover 5 into place agamst the rearend face of cylg k blade bars 27 in parallel longitudinal holes inder 4.A dowel pinlfi secures cover 5 in its angular position on cylinder 4:.Shell 6 has a screw threaded opening 17, at its rear end, to receive afluid supply pipe. Shell "6 has a reduced and tapered rear end portion18 and an enlarged front end portion 19 suitable for centering andguiding the motor around the curves of curved tubes. Shaft 7 has areduced rear end portion 20 carried Patented Jan. a, role.

by bearing rollers 21 in a cage 22 forming a 1 well known type of rollerbearing: A bear-. ing bush 23 is forced into cover 5 flush with theforward face thereof and forming a renewable bearing surface for theroller bearings. Bush 23 is held axially into place by a portion of itsfront end face overlying the rear end face of cylinder t. A forwardjournal portion 24: of shaft 7 is supported by a split bush 25 in thefront end of cylinder 4. Features of my invention are the form of v theblade and the slot and the means of sup-' porting and detaining theblade in the slot.

Centrifugal force, force of acceleration and pressure of the workingfluid on the edge of the blade all produce harmful pressure of the bladeagainst the cylindrical-wall of the chamber andare all reduced by makingthe blade thin and light. To resist the wearing friction against thecylinder wall, it is desirable to have the blade edges thickened and adragging or rearwardly extended ed e, in the motor form, is verydesirable to re uce edgewise forces on the blade and give a self closingor self packing contact line between the driven edge of the blade andthe cylindrical Wall of the chamber- The mechanical limitation to cheapmanufacture dictates that the blade shall be of such form that it can bereadily bent-from rolled sheet steel and that the slot in the shaftshall be of substantial Width, much greater than the thickness of thecentral portion of the blade. All parts should be or seats 28 in theshaft body extend part way into the slot, holding the blade diagonallyacross the slot, closing the space between the blade and slot againstleakage and preventing the blade falling out of the slot, when the shaftand blade are removed from the cylinder, until the bars are drawn.rearwardly out of the seats to release the blade. The bars 27 arenormally held in place by the bearing cage 22.

The blade bars 27 are located radially inward from the surface of shaft7 a distance to form externally open pockets 29 in the slot of suficientdepth to allow each edge portion of the blade to bury itself below theshaft surface in passing the abutment or contact line between shaft andchamber wall.

The slot 9 in the shaft 7 is formed with two long parallel faces 30,separated by a distance greater than the edge portions of the blade,and, at an angle thereto, with two short faces 31, diametricallyopposite each other in parallel planes separated a distance equal tothethin central body portion of the blade and on which the blade gets flatbearing surfaces as it lies in its normal position diagonally across theslot. The slot 9 is made slightly longer than the blade 8 to allow theshaft to float or move longitudinally as the bearings or shoulders wear.

To take apart. the motor, the cylinder is unscrewed from and drawn outof the shell taking the cylinder cover with it. The cylinder cover islifted off the cylinder. The I shaft is forced out of the cylinder,taking the split bush and blade with it. The blade bars are drawn out ofthe shaft from the rear end and the blade drawn from the slot.

The invention claimed is 1. In a rotary machine, a cylinder, a slottedshaft, a blade free to slide in. the slot of said shaft and a removablemember carried by said shaft to prevent said blade falling out.

2.111 a rotary machine, a cylinder, a cylinder cover, a slotted shaft, ablade free to slide in the slot of said shaft and normally held in placeby said cylinder and cylinder cover, -a removable member carried by saidshaft and normally locked in place by said cylinder and cylinder cover,said removable member preventing said the slot of said shaft when saidcylinder is removed.

3. Tn a rotary machine, a cylinder, a

blade falling out of slotted shaft, a blade free to slide in the slot ofsaid shaft and normally held in place by said cylinder and removablemeans for preventing said blade falling out of the slot of said shaftwhen said cylinder is removed.

4:. In a rotary machine, a cylinder, a shaft, a slot in said shaft, ablade sliding in said slot and a removable member for partly closing thewidth of said slot, said removable member being normally held in placeby the cylinder cover.

, 5. ln a rotary machine, a cylinder, a shaft, a, .diametric slotthrough said shaft, said slot being formed with two sets of surfaces twoof which are parallel with each other and t.e other two in parallelplanes with each other, but at an angle to the first two surfaces.

6. In a rotary motor, a cylinder, a shaft, a slot in, said shaft, ablade free to slide in said slot but thinner than the width thereof,said slot being formed with two sets of faces whereby said blade liesflat on one set of said faces while lying across the slot diagonally tothe other two faces.

7. In a rotary machine, a cylinder, a cylinder cover, a shaft, a slot insaid shaft, a blade lying through and diagonally across said slot and aremovable member normally retaining said blade in said diagonalposition.

8. lln a rotary machine, a cylinder, a cylinder cover, a shaft, a slotin said shaft, a blade lying through and diagonally across said slot anda removable member normally retaining said blade in said diagonalposition and said removable member being normally held in place by saidcylinder cover.

9. In a rotary machine, a cylinder, a shaft having a diametric slottherethrough, a blade inserted radially through said slot and aremovable retaining member inserted axially into said slot.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses this 23rd'day of November, 1914.

PHILIP J. DARLTNGTON.

Vfitnesses Bnigrrra A. Morin, PERRY C. SMITH.

